JP2721687B2 - Steering machine auto isolation system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a steering gear auto-isolation system.

[Conventional technology]

Conventionally, in a marine hydraulic steering system equipped with an auto isolation system, as shown in the system diagram of FIG.
Hydraulic pump unit 01,01 'is the main hydraulic pump unit 02,
02 ', auxiliary pump 03,03', motor 04,04 ', oil tank 0
5,05 'etc., actuator is cylinder 0
6,06 ', 06 ", 06, ram 07,07' and chiller 08. Transfer valves 09,09 'and auto isolation valves 010,010' are inserted in the hydraulic circuit between the hydraulic pump unit and the actuator. , A hydraulic pump unit, an oil tank, an actuator, valves, etc., are connected by oil pipes 011, 011 ′, 012, 012 ′, respectively.

In addition, oil pipes 013,013 'from the discharge ports of the auxiliary pumps 03,03'
Extend to transfer valves 09, 09 'and auto isolation valves 010, 010', respectively, and the respective auto isolation valves 010, 010 'are connected by an oil pipe 014.

As described above, the hydraulic circuit includes the hydraulic pump unit 1 and the transfer valves 09 and the hydraulic cylinders 06 and 06 'connected thereto, and the hydraulic pump unit 01' and the transfer valves 09 'and the hydraulic cylinders 06 connected thereto. ,, 06, which can be connected and disconnected through the oil pipe 014 by opening the auto isolation valves 010, 010 '.

The oil tank 05, 05 'detects a low oil level, issues a low oil level alarm, and at the same time, starts and stops the motors 04, 04' and opens and closes the auto isolation valves 010, 010 ', a level switch for low oil level alarm. 015, 015 'and low level oil level warning level switches 016, 016' are attached.

In such a hydraulic system, if a single failure occurs in any part of the piping system, oil leaks from this part, and if a low-pressure part occurs in a part of the piping system, the low-pressure oil pipe The oil is supplied from the oil tank 05 or 05 'by the supply pump 03 or 03' via the supply valve 017, 017 ', and the oil level in the oil tank gradually decreases with the supply of oil to the piping system. Eventually, it reaches the low oil level alarm setting level (the mounting position of the level switch 015 or 015 ').

Isolation valve is usually used for detecting low oil level.
The hydraulic system isolation valves 010, 010 ', which are connected to each other through the communication pipes 010, 010' and the communication pipe 014, are disconnected by closing, and the steering is connected separately.

That is, if the operation is continued in this state, the oil level of the oil tank in the hydraulic system on the side where the single failure has occurred progresses, and an even lower low oil level alarm, that is, a low level oil level alarm is issued. At this time, it is determined that the oil level has decreased, and it is determined that there is a single failure in the hydraulic system that issued the lower oil level alarm, that is, the low oil level alarm, and the auto isolation valve on this system side is closed. By stopping the hydraulic pump unit, the operation by the healthy hydraulic piping system is continued.

Thus, the low oil level alarm level switch attached to the oil tank detects a decrease in the oil level, thereby detecting oil leakage and judging which piping system has failed.

In addition, control is performed so that a signal of the low oil level is output only when the oil level is continuously lowered for a certain period of time so that the isolation does not malfunction by detecting the oil level drop due to the hull swing. A timer circuit is incorporated in the sequence.

[Problems to be solved by the invention]

However, when the isolation valve is closed and disconnected, and the hydraulic systems are individually steered via respective cylinders, it is necessary to match the ejection pressures of the two hydraulic pump units. If they do not match, the chiller will be subjected to two different jet pressure forces, resulting in imbalance and
There is a problem that it adversely affects the rudder shaft.

Oil leakage from the piping system due to failure or damage
The time required for the oil level to drop to the switch operating position varies greatly depending on the degree of damage. There is a case where the steering angle cannot be maintained at a predetermined angle because a reaction force that can be resisted cannot be output.

It is important to detect the state where the angle cannot be maintained at the specified angle as soon as possible.However, if the degree of leakage is small and the time until low oil level detection or low oil level detection takes a long time, In the picking device, the state where the course of the hull is not sufficiently controlled continues. The present invention has been proposed in view of such circumstances, and it is an object of the present invention to provide a steering auto-isolation system that can reliably determine an abnormal hydraulic system, perform switching, and maintain operation. Aim.

Furthermore, without relying on the detection of a drop in the oil level of the oil tank, it is possible to detect the hydraulic system abnormality and disconnect the faulty system at an early stage to prevent danger beforehand. The purpose is to provide a system.

[Means for solving the problem]

For this purpose, a first invention provides a chiller fitted to a rudder shaft, a plurality of hydraulic cylinders for rotating the chiller, a parallel hydraulic drive circuit for supplying and discharging hydraulic pressure to the plurality of hydraulic cylinders, In a steering device including an interconnection line that connects a drive circuit via a plurality of isolation valves, an abnormality determination circuit that determines whether there is an abnormality in a hydraulic system when one of the isolation valves is closed; When an abnormality is detected from the determination circuit, one hydraulic drive circuit is disconnected and the other hydraulic drive circuit is operated, and when no abnormality is detected from the abnormality determination circuit, the other hydraulic drive circuit is disconnected and one hydraulic drive circuit is disconnected. And a driving continuation means for driving.

A second invention provides a chiller fitted to a rudder shaft, a plurality of hydraulic cylinders for rotating the chiller, a parallel hydraulic drive circuit for supplying and discharging hydraulic pressure to the plurality of hydraulic cylinders, and the parallel hydraulic drive circuit. In a steering device comprising an interconnection line that connects through a plurality of isolation valves, a strain gauge attached to the rudder shaft and detecting a change in the torque, and the output of the strain gauge being equal to or more than a set time and equal to or less than a set value. When an abnormality is detected in the hydraulic system, the abnormality determination circuit determines whether or not there is an abnormality in the hydraulic system when one of the isolation valves is closed. Disconnect the hydraulic drive circuit and operate the other hydraulic drive circuit.If no abnormality is detected from the abnormality determination circuit, disconnect the other hydraulic drive circuit. Characterized in that comprises a continuous driving means for driving one of the hydraulic drive circuit with you.

A third invention provides a chiller fitted to a rudder shaft, a hydraulic cylinder that rotates the chiller, a hydraulic drive circuit that supplies and discharges hydraulic pressure to and from the hydraulic cylinder, and a change in the torque that is attached to the rudder shaft. A strain gauge to be detected is provided, and an abnormality determination circuit that determines an abnormality in the hydraulic system when the output of the strain gauge becomes equal to or less than a set time and equal to or less than a set value.

[Action]

According to such a configuration, first, occurrence of an abnormality in the hydraulic drive circuit is detected by detecting torque of the rudder shaft, and then, steering is performed by only one drive hydraulic circuit by opening and closing one of the isolation valves. The damaged drive hydraulic circuit is automatically identified based on the output of the determination circuit at that time, and the damaged drive hydraulic circuit is disconnected and disabled by the interlocking opening and closing of the isolation valve. It is performed only by the hydraulic circuit.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a system diagram, FIG. 2 is a flowchart of a detection circuit when steering control becomes impossible due to failure of the device of FIG. 1, and FIG. FIG. 2 is a flowchart showing an operation of disconnecting a failed drive system in FIG. 1 and recovering control ability by a healthy drive system.

First, in FIG. 1, torsional torque is generated on the rudder shaft 1 by the force generated by the water flow on the rudder plate 2 and the reaction force generated by the steering device 3, and a distortion is generated on the rudder shaft surface. This strain is detected by a strain gauge 4 attached to the rudder shaft surface, and is detected as a torque value by an amplifier and a converter 5.

Now, when such a hydraulic system of the steering device 3 is damaged, the steering device cannot generate a reaction force against the rudder plate load, and no torsional stress is generated on the rudder shaft. Therefore,
No strain value is detected or only a very small value appears on the strain gauge on the rudder shaft (only a slight reaction force is generated due to friction of the steering device itself). The detected torque value is compared with the set torque value by the comparator 6, and when the detected torque value is smaller than the set value, the contact signal 7 is transmitted to the auto isolation control panel 8.

Here, while the steering angle is being changed, that is, during turning,
The steering device only follows the movement of the rudder plate, and there may be a state in which the rudder plate moves without any special reaction force. in this case,
During the time required for turning, even if there is no abnormality in the hydraulic system, the measured torsional stress in the rudder shaft can be at a low level.
Therefore, when a torque equal to or less than the set level is detected, the contact signal 7 is transmitted to the auto-isolation control panel 8 by the comparator 6, and the control circuit outputs "contact signal 7" only when the contact signal 7 continues for a specified time or more. "Abnormal".

FIG. 2 illustrates the above-described abnormality determination operation.

Next, when "out of control (abnormal)" is detected during normal operation in this way, as shown in FIG.
First, the hydraulic drive system is once brought into an operating state in both systems. That is, if only one side drive system is operating until then, the remaining stopped drive systems are driven, and the two drive systems are operated in parallel. If both drive systems are already operating, the operation for opening / closing the isolation valve is performed without performing the operation for shifting to the parallel operation.

At this point, it is still unclear which drive system has a failure (abnormality). Therefore, first, the No. 1 isolation valve 11 is closed, and the No. 1 hydraulic pump 12,
The operation by the combination of the hydraulic cylinders 13 and 14 is performed. Then, by closing the No. 1 isolation valve 11, a bypass state is established between the two discharge ports of the No. 2 hydraulic pump 12 'and between the two hydraulic cylinders 13' and 14 '.

If the damage (abnormality) is on the No. 1 drive system side, even if the operation is continued in the above state, the steering device cannot generate a reaction force against the load, and therefore, the control becomes impossible ( Steering impossible / abnormal) is detected. Only at this point, it is mechanically and electrically recognized that the damage is on the No. 1 drive system side, and the control circuit separates the No. 1 drive system and operates with the sound No. 2 drive system in a later manner. Continuation is performed in the following procedure.

That is, when the control failure is detected in a state where the No. 1 isolation valve 11 is closed, the No. 1 isolation valve 11 is opened again, and then the motor 10 of the No. 1 drive system is stopped. Also, No.2 isolation valve
Close 11 ', No.2 hydraulic pump 12', hydraulic cylinder 1
Steering ability is restored using 3 ', 14'. On the other hand, between the hydraulic cylinders 13 and 14 where the hydraulic oil moves between each other,
When the No. 2 auto isolation valve 11 is closed, a bypass state is established. Thus, the operation is maintained by the No. 2 drive system.

If the damage is on the No. 2 drive system side, parallel operation of both drive systems and the No. 1 isolation valve 11
By closing, the operation is performed by the healthy No. 1 drive system, and the “out of control” is not detected. Therefore, if this state continues, it is determined that the No. 2 drive system is damaged, the No. 2 hydraulic pump motor 10 'is stopped, and the operation is continued with the No. 1 drive system.

〔The invention's effect〕

According to such a device, it is possible to reliably determine an abnormal hydraulic system, perform switching, and maintain operation.
Further, by detecting damage (failure) of the drive device in a short time and recovering the control ability at an early stage, it is possible to particularly secure the navigation of the ship.

[Brief description of the drawings]

FIG. 1 is an overall system diagram showing an embodiment of the present invention, FIG. 2 is a flowchart of a detection circuit when steering control becomes impossible due to a failure of the device of FIG. 1, and FIG. It is a flowchart which shows the effect | action until a faulty drive system is isolate | separated and control capability recovery by a healthy drive system. FIG. 4 is an overall system diagram showing a known marine hydraulic steering device. DESCRIPTION OF SYMBOLS 1 ... Rudder axis, 2 ... Rudder plate, 3 ... Steering device, 4 ... Strain gauge, 5 ... Amplifier and converter, 6 ... Comparator, 7 ...
Contact signal, 8 ... Auto-isolation control panel, 9 ...
... wiring, 10 ... No.1 motor, 10 '... No.2 motor,
11 ... No.1 isolation valve, 11 '... No.2 isolation valve, 12 ... No.1 hydraulic pump, 12' ...
No.2 hydraulic pump, 13,13 '…… Hydraulic cylinder, 14,14'
…… Hydraulic cylinder

Claims (3)

(57) [Claims] A chiller fitted to a rudder shaft; a plurality of hydraulic cylinders for rotating the chiller; a parallel hydraulic drive circuit for supplying and discharging hydraulic pressure to the plurality of hydraulic cylinders; and a parallel hydraulic drive circuit. In a steering device including an interconnection line connected via a plurality of isolation valves, an abnormality determination circuit that determines whether there is an abnormality in a hydraulic system when one of the isolation valves is closed, and the abnormality determination circuit An operation of disconnecting one hydraulic drive circuit and operating the other hydraulic drive circuit when an abnormality is detected, and disconnecting the other hydraulic drive circuit and operating one hydraulic drive circuit when no abnormality is detected from the abnormality determination circuit. A steering device comprising continuation means. 2. A chiller fitted to a rudder shaft, a plurality of hydraulic cylinders for rotating the chiller, a parallel hydraulic drive circuit for supplying and discharging hydraulic pressure to and from the plurality of hydraulic cylinders, and the parallel hydraulic drive circuit. In a steering device consisting of an interconnection line connected via a plurality of isolation valves, a strain gauge attached to a rudder shaft and detecting a change in the torque, and an output of the strain gauge being equal to or more than a set time and equal to or less than a set value. An abnormality determination circuit that determines whether or not the hydraulic system has an abnormality when one of the isolation valves is closed, and one hydraulic circuit when the abnormality is detected from the above-described determination circuit. Disconnect the drive circuit and operate the other hydraulic drive circuit. If no abnormality is detected from the abnormality determination circuit, disconnect the other hydraulic drive circuit. Steering apparatus being characterized in that comprises a continuous driving means for driving the one of the hydraulic drive circuit with. 3. A chiller fitted to a rudder shaft, a hydraulic cylinder for rotating the chiller, a hydraulic drive circuit for supplying and discharging hydraulic pressure to and from the hydraulic cylinder, and detecting a change in torque provided on the rudder shaft. A strain gage that performs an operation and an abnormality determination circuit that determines an abnormality in the hydraulic system when the output of the strain gage becomes equal to or less than a set time and equal to or less than a set value.